What size rear tires will work on a 900 classic - Kawasaki Vulcan Forum : Vulcan Forums
 
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post #1 of 7 (permalink) Old 03-08-2018, 09:21 AM Thread Starter
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Wondering how tall and wide is possible with no mods?
And will going to a 170 in the rear instead of a 180 correct the speedo as someone mentioned?

2006 Vulcan 900 LT. Blue/Silver
Mods:
Partial Debaffle of exhaust
Crash bars
Custom grips
Passenger floor boards
Chrome radiator grill
Baron Big Air kit
Memphis Shades lowers
Michelin Commander II tires

Last edited by Zzman; 03-08-2018 at 09:28 AM.
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post #2 of 7 (permalink) Old 03-08-2018, 10:14 AM
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I don't know about the 900 but my 750's speedometer runs off the front wheel. I put a taller front tire (from a 100 to a 110) on mine to help do what you are looking to do.

A 750's speedo is normally off maybe 10% with the stock height tire and I brought it more to 5% or 6%. The speedo shows a faster speed than actually being travelled.

To that end, I generally look at my speedo as being cop-proof as they can never catch me for speeding if I set the speedometer on whatever the speed limit is. I use my GPS for knowing my actual speed.

So, my speedometer is my police speed, my GPS is my true speed.

Is the 900 run off the rear?

Chris Cochran
Retired USAF '74 to '95 AMMO
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post #3 of 7 (permalink) Old 03-08-2018, 10:39 AM
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I was using 200 in the rear. The 200 is a little bit taller than 180 i had a small almost insignificant correction to the speedo. 200 is the biggest tire you can fit in the back without modifications. 170 will only increase the difference.
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post #4 of 7 (permalink) Old 03-08-2018, 11:20 AM
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I guess the 900 does run the speedo off the rear, then. Well, if my own experience is any indication, I used the next taller tire and gained around 4 -5% closer to truth. It seems logical that if you go two sizes taller you'd get it closer to the truth.
How far off is the stock tire sized speedometer from reality?

Chris Cochran
Retired USAF '74 to '95 AMMO
Engine guard with highway pegs
Luggage rack
GPS on RAM handlebar mount
MCCTs replaced ACCTs
Iridium plugs: DPR7EIX-9
Custom made seat (verrry comfortable)
LED turn signals with rear signals relocated
LED license plate holder
Hard mounted Viking saddlebags
Hard mounted fork tool bag (free from Viking)
LED running lights on custom light bar
National Cycles Low Boy Heavy Duty windshield
Home made lowers
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post #5 of 7 (permalink) Old 03-08-2018, 01:49 PM
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Quote:
Originally Posted by VN750Guy** View Post
I guess the 900 does run the speedo off the rear, then. Well, if my own experience is any indication, I used the next taller tire and gained around 4 -5% closer to truth. It seems logical that if you go two sizes taller you'd get it closer to the truth.
How far off is the stock tire sized speedometer from reality?
The 900's speedo runs off a crankshaft sensor, so kind of indirectly off the rear wheel. Mine read consistently 10% high (e.g. 72 indicated = 65 true), which is fairly common, until I installed the Baron front pulley. Now it's dead on.

Gripping the throttle, his knuckles went white with desire; the wheels of his Vulcan exploding on the highway like a slug from a .45...
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post #6 of 7 (permalink) Old 03-08-2018, 01:57 PM
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Two big time different approaches to working the speedometer. Of course, my bike's design is from the early-mid 80's.

The only thing in common is the 10% off high reading.

Its nice that you can do something to get it actually correct.

Chris Cochran
Retired USAF '74 to '95 AMMO
Engine guard with highway pegs
Luggage rack
GPS on RAM handlebar mount
MCCTs replaced ACCTs
Iridium plugs: DPR7EIX-9
Custom made seat (verrry comfortable)
LED turn signals with rear signals relocated
LED license plate holder
Hard mounted Viking saddlebags
Hard mounted fork tool bag (free from Viking)
LED running lights on custom light bar
National Cycles Low Boy Heavy Duty windshield
Home made lowers
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post #7 of 7 (permalink) Old 03-08-2018, 02:00 PM
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It's nothing new, sadly. All but one of my bikes has been 10-15% off; the only exception was my 2016 CB500F. I don't understand why it's so bloody difficult for manufacturers to get it right. (Don't get me started on fuel gauges.)

Gripping the throttle, his knuckles went white with desire; the wheels of his Vulcan exploding on the highway like a slug from a .45...
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